If a deployment has a dependency on a static module and is configured to want annotation data from that module, some consumers of Jandex indices created from the module are not getting all possible indices. Specifically, WarAnnotationDeploymentProcessor is using a deployment unit attachment to obtain indices, but that attachment only contains indices for modules that have at least one META-INF/jandex.idx file in a resource. Indices created from modules without that (via class scanning) are not added to the attachment.

See discussion at https://github.com/wildfly/wildfly-core/pull/4708/files#r689778092